Question

Arrange the following metals in the order in which they displace each other from the solution of their salts.
Al, Cu, Fe, Mg and Zn.

Answer 1

A metal of stronger reducing power displaces another metal of weaker reducing power from its solution of salt.
The order of the increasing reducing power of the given metals is
$Cu < Fe < Zn < Al < Mg$.
Hence, we can say that Mg can displace $Al$ from its salt solution, but Al cannot displace $Mg$.
Thus, the order in which the given metals displace each other from the solution of their salts is given below:
$Mg>Al> Zn> Fe>Cu$